Last updated: June 24, 2025
In St. Charles, United States, the average temperature for June settles at a comfortable 22°C (72°F). While temperatures can dip to a cool 9°C (49°F), they can also soar to a warm 34°C (93°F). Expect 140 mm (5.5 in) of precipitation spread over 14 days, contributing to an average humidity of 82%. Prepare for a month of contrasts, where warm days and refreshing rain can create a unique atmosphere!
In June in St. Charles, the average temperature is 22°C (72°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 9°C (49°F). This makes it a perfect time for travelers to enjoy a diverse range of outdoor activities in comfortable weather.
In St. Charles in June, the precipitation amount is 140 mm (5.5 in) over the course of 14 days.
In St. Charles in June humidity is 82%. With an average temperature of 22°C (72°F), this humidity feels like walking through a warm, damp blanket, making travel feel more exhausting and sticky as sweat clings to your skin, and every step seems to draw you into a slow, sultry embrace.
In St. Charles in June, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in St. Charles.
UV Risk Categories
Weather in St. Charles varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in St. Charles, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 61 mm (2.4 inches) | 82% | moderate |
| February Weather | -3°C (27°F) | 59 mm (2.3 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 81 mm (3.2 inches) | 84% | high |
| April Weather | 9°C (48°F) | 117 mm (4.6 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 168 mm (6.6 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 140 mm (5.5 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 106 mm (4.2 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 99 mm (3.9 inches) | 81% | very high |
| September Weather | 19°C (67°F) | 91 mm (3.6 inches) | 80% | very high |
| October Weather | 12°C (54°F) | 127 mm (5.0 inches) | 82% | high |
| November Weather | 3°C (38°F) | 54 mm (2.1 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 53 mm (2.1 inches) | 84% | low |